I only have the Plan B and I really like it. But every time I see a MAM in the Tangerine I wonder if maybe I should've gotten that instead? I also adore the Nikki. All the new green colors coming I plan on getting either a Nikki or MAM.
I love my Nikki. The only down side to the Nikki is the top part of the strap is so stiff that it stabs into my shoulder a bit.
I am also falling for the MAM again.